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Old 02-08-2015, 04:43 AM
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Jeep Grand Cherokee hemi cooling fan

Hi folks.
I have a 2006 grand cherokee 5.7 Hemi WK.
I had to have the engine removed after the previous owner drove into water that got into the engine and broke a rod.
We rebuilt the engine and all is good.
After the mechanic put the engine back in and I collected the jeep I noticed the power steering pump was faulty. And the cooling fan was spinning too fast.
I had the steering pump replaced. Along with the fluid reservoir. (We discovered a crack in it )
Power steering is now fine. But the cooling fan is still
Spinning too fast.
I sat one day and spun the steering back and forward about 40 times with the engine running. It slowed a little. But it still far too fast. You can't hear the engine at tick over because of fan noise.
If you turn the steering full lock it practically stops the fan.
And when you Rev the engine or accelerate when driving the fan speed rises and falls directly with engine revs.
Sorry this is a bit long winded. But I am beat lol

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  #2  
Old 02-08-2015, 05:42 AM
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Re: Jeep Grand Cherokee hemi cooling fan

Welcome to the garage.
The hydraulic cooling fan should run between 100 and 500 rpm with engine at idle. The PCM controls the solenoid on the fan to regulate the fan speed to higher rpm. The PCM uses inputs from engine coolant temperature, transmission fluid temperature and A/C system pressure to regulate the speed. If the PCM looses the input from the coolant temperature, it will put the fan in full speed as fail safe. Do you think that the fan is at full speed, or somewhere in between? You can remove the engine coolant temperature sensor connector to check if there is any increase in speed. A DTC will be set, which has to be reset after connecting the connector.
The A/C system was probably recharged after the engine change. Maybe a too high of a pressure is in there now (overcharged), causing the PCM to increase the fan speed?
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Old 02-08-2015, 05:46 AM
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Re: Jeep Grand Cherokee hemi cooling fan

Hi.
It not running full speed. But it is certainly running well over 500 rpm at idle. And fan rpm increases directly with engine rpm. Have you any idea where the coolant sensor is?
And the AC has not been recharged yet.


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Old 02-08-2015, 06:40 AM
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Re: Jeep Grand Cherokee hemi cooling fan

Ok, attached the ECT sensor location.
When you remove the connector from the fan solenoid, then it should run at minimum speed. If it then still runs too fast, then it looks like the solenoid is sticking. Maybe a gentle tap on the side of the solenoid could reset it.
Attached Files
File Type: pdf 5.7L ECT.pdf (222.5 KB, 16 views)
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Old 02-08-2015, 09:19 AM
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Re: Jeep Grand Cherokee hemi cooling fan

Ok. Thanks buddy. I will try that.
Though mine does now have any solenoid fitted for the fan.
Is that because it's fitted with the tow pack?



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Old 02-08-2015, 09:22 AM
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Re: Jeep Grand Cherokee hemi cooling fan

Sorry I misread your reply.
What I meant to say was. Mine does not have a relay fitted for the fan. Is the relay only for the electric fan? Mine has the tow pack.
I will
Look at that solenoid now


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Old 02-08-2015, 01:25 PM
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Re: Jeep Grand Cherokee hemi cooling fan

Your jeep has the hydraulic fan setup, right? Then there is a small solenoid mounted on the hydraulic control part of the fan, which is used to control the fan speed. There is no relay involved in this cooling system.
On the job now, so canīt add any manual pages. If you canīt find the solenoid, then i can send you a manual page which shows the solenoid tomorrow.
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Old 02-11-2015, 03:54 PM
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Re: Jeep Grand Cherokee hemi cooling fan

Ok I disconnected the etc. No change at all. I then disconnected the solenoid on the fan. Also no change.


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Old 02-11-2015, 04:41 PM
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Re: Jeep Grand Cherokee hemi cooling fan

Seems almost if the solenoid is stuck in one position. Did you already try to tap gently on the solenoid?
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Old 02-11-2015, 05:00 PM
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Re: Jeep Grand Cherokee hemi cooling fan

Yeah I tried that. No change.
Can you replace the solenoid?


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  #11  
Old 02-11-2015, 07:35 PM
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Re: Jeep Grand Cherokee hemi cooling fan

You can replace the solenoid and maybe you can just remove it first and check if there is anything blocking it. The problem is that mopar doesnīt deliver the solenoid separatelr, but only a complete hydraulic motor assy. Ford however is using this same hydraulic motor assy and solenoid and sells the solenoid separately. The only problem is that the connector is different then from the jeep solenoid. You could maybe splice the right connector in.
Still strange though that before the engine problem the fan was working fine.
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Old 02-12-2015, 02:45 AM
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Re: Jeep Grand Cherokee hemi cooling fan

The guy that put the engine back in had mentioned that he had real trouble getting the fan to bleed up. Last night I noticed marks on the solenoid Almost like it had been held with vice grips. I called and ask him about it. He denied any knowledge.
But he sounded a bit guilty lol.


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